hey, Ross, although I have a set of DeCuzzi tires mounted I have not run on them yet. Most if us are trying to use up our Burris tires which are only usable to mid season. maybe someone who has raced on them can chime in. As far as the size I'm sorry but I just don't have that info.
It looks like they come in 4 different compounds. The best I can figure is they are used at many indoor and rental type places. I'm guessing that you guys bought the #5, 120 hour, softest compound but I was hopping that whoever bought all the tires for the club could confirm that for me. I found one place that sells a set of the #5 compound for $150 with shipping.
I think they're a fun tire to drive on. They are easy to drift and are predictable at the limit. They appear to wear well. They're not particularly fast in terms of overall lap times, but with an entire field on the same tire I predict they'll be fun to race on and take a good amount of abuse.